CN102747213A - Cooling method for continuous heat treatment of high-strength steel - Google Patents
Cooling method for continuous heat treatment of high-strength steel Download PDFInfo
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- CN102747213A CN102747213A CN2011101017970A CN201110101797A CN102747213A CN 102747213 A CN102747213 A CN 102747213A CN 2011101017970 A CN2011101017970 A CN 2011101017970A CN 201110101797 A CN201110101797 A CN 201110101797A CN 102747213 A CN102747213 A CN 102747213A
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Abstract
The invention discloses a cooling method for continuous heat treatment of a high-strength steel, which comprises the following steps: 1) performing air injection slow-cooling on the strip steel surface of an soaking zone passed through a continuous annealing furnace; 2) using an aerosol cooling device to inject cooling water aerosol on the strip steel surface for aerosol cooling; 3) using a cooling water injection apparatus to inject layered water column on the strip steel surface, wherein the included angle of the injection direction of the layered water column and the moving direction of the strip steel presents an acute angle; 4) using a first nozzle apparatus to inject high speed water flow on the strip steel surface, wherein the speed arrangement of the high speed current can be set as to blow the steam bubbles and vapor films on the strip steel surface away; 5) soaking the strip steel in cooling water, using a second nozzle provided under the liquid surface of the cooling water to inject high speed water flow to the strip steel surface, blowing the steam bubbles and vapor films on the strip steel surface away by the high speed current; and 6) drying the cooling water on the strip steel surface.
Description
Technical field
The present invention relates to the method for cooling of cold rolled strip, relate in particular to a kind of method of cooling of plow-steel.
Background technology
Along with the development of industrial technology and the raising of modern metallurgic product performance, the market requirement of cold rolling high-strength steel and super-high strength steel is increasing.At present; In order to reduce the content of high tensile steel plate alloying element; Reduce the production cost of high-strength steel; The welding property and the manufacturability that improve steel plate simultaneously can (comprise operation productions such as being easy to continuous casting, hot rolling, pickling, side cut, cold rolling, annealing), need behind steel plate annealing, carry out quick processing under cooling usually.Method for rapid cooling commonly used at present normally adopts the jet cooling of high hydrogen, aerosol cooling or shrend cooling to cool off fast after the steel plate slow cooling.
Though it is better that the jet method of cooling of high hydrogen is cooled off even belt plate shape; But the speed of cooling of high hydrogen shower cooling is usually less than 150 ℃/s (as far as the band steel of 1mm thickness); Speed of cooling is slow, can't satisfy the thermal treatment process requirement of AHSS plate, particularly ultrahigh-strength steel plates.
Traditional shrend method or speed of cooling are not enough, or speed of cooling is not controlled, and the cooling uniformity of traditional shrend method is all poor, and the band steel of production is easy to generate performance inequality, the bad problem of plate shape.
Publication number is US4330112; Open day is May 18 nineteen eighty-two; Name is called " the band steel refrigerating unit of continuous annealing production line " (Apparatus for cooling a steel strip in a continuous annealing line) USP and discloses a kind of shrend method of cooling; This method adopts device cooling zone steel shown in Figure 1: extract water coolants in the hardening groove 11 out with water pump 12 earlier and deliver to sparging unit 13 through pipeline and be ejected into belt steel surface and cool off, will be with steel immersion hardening groove 11 to cool off again.This method relatively is suitable for the quick cooling of low temperate zone steel; Can the band steel about 400 ℃ be cooled to below 60～95 ℃; But not enough below existing: (1) scope of application is narrower; Be only applicable to the shrend production of low temperate zone steel, be difficult to be applied to high-temperature water quenching (being cooled to below 90 ℃) at the thermal zone steel about with 700 ℃ under the ordinary production speed; (2) water smoke and the water vapour that are produced of cooling zone steel is easy to get in the stove of front, makes the equipment corrosion serious; (3) beginning shower cooling place, the shower cooling water capacity is prone to splash, and causes band steel inhomogeneous cooling and plate shape bad.
In addition; When adopting traditional immersed type shrend method cooling down high-temperature band steel, because belt steel temperature is too high before the shrend, a large amount of bubble that the shrend process produces and steam film can hinder the further cooling fast of band steel; To produce the big ups and downs of spray sputter and watch-quench tank liquid level in addition at the high-speed cruising of watch-quench tank with steel; The asynchronism(-nization) step of thermal zone steel contact cooling water on width when these have all caused the beginning shrend, thus cause speed of cooling there are differences, cause that also band molten steel quenching is uneven, performance is uneven and plate shape is bad; And high-performance is inhomogeneous more more for the intensity of band steel, and plate shape is poor more.
Summary of the invention
The method of cooling that the purpose of this invention is to provide a kind of high-strength steel continuous heat treatment; This method of cooling reaches bigger and controlled average cooling rate in the time of can realizing cooling off with steel; Realize the quick cooling of band steel, can also guarantee to cool off the band steel of evenly producing simultaneously and have good plate shape.This method is through adopting gas slow cooling in short-term+aerosol cooling+shrend refrigerative method; Make and in the substrate of steel plate, add under the situation of a small amount of alloying element; Can produce the higher advanced high-strength steel product of strength grade; And through the heat treated speed of cooling of flexible band steel, produce phase transformation strengthening high-strength steel product with various intensity ranks, guarantee that simultaneously this high-strength steel product has uniform performance more, better plate shape.
The present invention provides a kind of method of cooling of high-strength steel continuous heat treatment according to the foregoing invention purpose, and it comprises the following steps:
The belt steel surface that (1) will pass through the continuous annealing furnace soaking zone carries out jet slow cooling;
(2) adopt an aerosol refrigerating unit shower cooling aqueous vapor mist that belt steel surface is carried out the aerosol cooling;
(3) adopt a cooling water jet unit to spray the stratiform water column to belt steel surface, the injection direction of layered water column is the acute angle angle with the direct of travel of band steel;
(4) adopt one first tuyere arrangement to spray high velocity jet to belt steel surface, the speed of said high velocity jet is set to the vapor bubbles of belt steel surface and the steam film belt steel surface that blows off;
(5) will be with steel to be immersed in the water coolant, and adopt one to be arranged at subsurface second tuyere arrangement of water coolant and to spray high velocity jet to belt steel surface, the speed of said high velocity jet is set to the vapor bubbles of belt steel surface and the steam film belt steel surface that blows off;
(6) water coolant of belt steel surface is dried.
The present technique scheme is at first carried out jet slow cooling to the band steel through the continuous annealing furnace soaking zone; This is because it can be according to the high-intensity band steel flexible slow cooling temperature and the scope of varying strength rank and thermal treatment process requirement; Thereby the accommodation zone steel begins quick refrigerative temperature, and then realizes the adjusting significantly to band steel average cooling rate and cooling curve.
The aerosol cooling is a kind of gas and water droplet two method of cooling, though it compares the shortcoming that has speed of cooling on the low side with simple shrend method, it also has following advantage:
(1) its coefficient of heat transfer can reach 5000～10000kcal/m2.h. ℃, much larger than jet cooling (even the high concentration hydrogen cooling also can only reach 750kcal/m2.h. ℃);
(2) it can come controlled chilling speed through regulating pondage, and controllability is strong, is prone to realize the accurate control of band steel cooling terminal temperature;
(3) the aerosol cooling is adjustable controlled on the strip width direction, helps forming good plate shape with steel.
Therefore; The present technique scheme (is provided with aerosol cooling section (aerosol refrigerating unit) in the slow cooling section between step 1) and the shrend cooling section (step 3-5); Realize the lifting gradually of band steel rate of cooling in process of cooling; So not only can shorten the length of leer section greatly; Improve the average rate of cooling of band steel in whole process of cooling, what can also solve preferably that traditional shrend method exists goes into the higher inhomogeneous cooling that produces of water temp, performance inequality and the bad problem of plate shape because of the band steel, thereby can satisfy other AHSS plate of different steel grade different intensity scales preferably; Particularly ultrahigh-strength steel plates is to the processing requirement and the specification of quality of thermal treatment speed of cooling; Guarantee in the substrate of steel plate, to add under the condition of a small amount of alloying element, produce the AHSS plate of various intensity ranks, improve its use properties and reduce the high-strength steel production cost with good plate shape.
In addition; The present technique scheme is in order to guarantee to be with steel contact cooling water equably when the shrend; And the water droplet of avoiding splashing just touches belt steel surface before shrend begins, and realizes the quick cooling of band steel simultaneously, and it will pass through aerosol refrigerative band steel; Adopt cooling water jet unit to being with steel upper and lower (left and right) jet surface earlier along uniform, the stable stratiform water column of strip width direction; And the injection direction of this stratiform water column is an acute angle with the formed angle of band steel traffic direction, and the stratiform water column can guarantee to be with steel on width, all can obtain even cooling, can guarantee that there is water-drop sputtering stratiform water column below even the injection direction of stratiform water column is the acute angle angle with band steel direct of travel; Also can be blocked, can not touch the preceding band steel of beginning shrend by water column.And then adopt first tuyere arrangement to spray high velocity jet to belt steel surface; Be for quick cooling zone steel further; Simultaneously it is the vapor bubbles of belt steel surface and the steam film band steel that blows off fast, equably, is with rigidity can evenly and obtain good plate shape to guarantee evenly to make with the steel cooling.Need to prove; The speed of the high velocity jet in the present technique scheme needs specifically to regulate according to the concrete condition of production; Its final velocity should be able to that (vapor bubbles and steam film are in the shrend step of having carried out with the vapor bubbles of belt steel surface and steam film; Form at belt steel surface because cryogenic water coolant runs into pyritous band steel) the band steel that blows off fast, equably, the vapor bubbles of these belt steel surfaces or steam film can influence the speed of cooling and the cooling uniformity of band steel.At last; To be with steel to be immersed in the water coolant cools off; Below the liquid level of water coolant, adopting second tuyere arrangement to spray high velocity jet to the band steel simultaneously, is near the cooling-water flow reinforcing band steel, thus the speed of cooling of reinforcing band steel; Vapor bubbles that simultaneously belt steel surface shrend process is produced and the vapor film belt steel surface that blows off rapidly improves the shrend effect.
Preferably, the injection direction of the high velocity jet in the said step (5) is the acute angle angle with band steel direct of travel, can reduce the fluctuation of water coolant liquid level and the detrimentally affect that the spray sputter causes belt plate shape like this.
Alternatively, the injection direction of the high velocity jet in the said step (4) is vertical with the direct of travel of band steel.
Preferably, the injection direction of the high velocity jet in the said step (4) is the acute angle angle with the direct of travel of band steel, and it can prevent the disadvantageous effect of water-drop sputtering to band steel cooling performance.
The temperature of the water coolant that preferably, is adopted in said step (2)-(5) is below 70 ℃.
The temperature of the water coolant that further preferably, is adopted in said step (2)-(5) is below 50 ℃.
Further preferably, the water coolant that is adopted in said step (2)-(5) is a refrigerated water.When the present technique scheme adopts refrigerated water as the shrend heat-eliminating medium, the starting stage at band steel contact cooling water, though the water temperature of refrigerated water raises, can not generate bubble, thereby guarantee that the band steel cools off equably.
Preferably, the cooling water jet unit that adopts in the said step (3) is the water cutter.
Preferably; The aerosol refrigerating unit that adopts in the said step (2) have gas orifice and with the vertically disposed water outlet of said gas orifice; The gas direction (also being the aerosol injection direction) of said gas orifice ejection is vertical with band steel direct of travel; And vertical with the water (flow) direction of water outlet ejection, gas-liquid two-phase forms said water coolant aerosol near belt steel surface.
When above-mentioned aerosol refrigerating unit was worked, by the airstream belt steel of gas orifice ejection, the water jet of inciting somebody to action water outlet ejection from bottom to top at the outlet air jet of aerosol refrigerating unit smashed the formation aerosol.Because the gas-liquid angle is 90 °, gas energy is fully used, and makes the liquid bundle be in best shearing condition, can effectively the liquid bundle be broken for the drop crowd.This aerosol refrigerating unit is compared with existing pressure atomization type refrigerating unit, and is simple in structure, easy processing and fabricating, and also the diameter in water hole is big, is not easy fouling and stops up, and has adapted to the requirement of continuous heat treatment unit " zero dimension is protected ".Atomizing does not simultaneously need high-pressure air; Common blower fan just can be realized atomizing, if stop to supply water, can also use as the high speed jet nozzle; Therefore this aerosol refrigerating unit has air-cooled and the cold two kinds of functions of mist, can improve speed of cooling and cooling curve regulation range before the band molten steel is quenched significantly.
The method of cooling of high-strength steel continuous heat treatment of the present invention is through adopting technique scheme; Thereby the average rate of cooling that can obtain to suit cools down the band steel of differing temps according to the cooling curve that different high-strength steel product thermal treatment process require equably fast; Can in the substrate of steel plate, add under the situation of a small amount of alloying element, produce have HS more, 780MPa, 980MPa, 1180MPa, 1280MPa and many kinds of kinds of 1470MPa, the advanced high-strength steel product of multiple intensity rank of uniform performance, better plate shape more.
In addition; The method of cooling of high-strength steel continuous heat treatment of the present invention is through the aerosol cooling step; Realized the lifting gradually of band steel rate of cooling, it can realize the flexible control with the steel cooling curve through the flexible design of each cooling section length and cooling power and use flexibly.General traditional shrend technology band steel slow cooling terminal temperature; Shrend is just gone into water temp and all is lower than 700 ℃ (for example 680 ℃); 12s if desired from about about 800 ℃ the soaking temperature slow cooling to 680 ℃, the aerosol cooling step that adopts the present technique scheme to adopt can be brought up to 760 ℃ to slow cooling terminal temperature (being that water temp is gone in shrend), and corresponding slow cooling time decreased is to 4s; Reduced 2/3rds than conventional cooling methods; That is to say that technical scheme of the present invention only needs the time about 1s just can the band steel about 760 ℃ be cooled to make shrend go into water temp and obviously reduce below 600 ℃ through the aerosol cooling step; Thereby improve cooling uniformity and belt plate shape; Average cooling rate can be brought up to original twice simultaneously, owing to set up the average cooling rate that the aerosol cooling step has further improved the band steel, it makes the alloying element that in the substrate of steel plate, adds less amount also can produce the more advanced high-strength steel product of high intensity levels; Can also improve simultaneously the use properties of high-strength steel product, like welding property etc.
In addition; Shrend cooling step in the method for cooling of high-strength steel continuous heat treatment of the present invention can be realized quick, the evenly cooling with steel; Guarantee that the water droplet that shower cooling splashes can not touch the preceding band steel of shrend; Thereby further guarantee the evenly cooling fast of band steel, produce the intensity advanced high-intensity band steel that more high-performance more evenly, plate shape is better.
Description of drawings
Fig. 1 is that publication number is the structural representation of the disclosed technical scheme of USP of US4330112.
Fig. 2 is the method for cooling schema of high-strength steel continuous heat treatment of the present invention.
Fig. 3 is the structural representation of the aerosol refrigerating unit that adopted in an embodiment of the step (2) of the method for cooling of high-strength steel continuous heat treatment of the present invention.
Fig. 4 is the lateral plan of aerosol refrigerating unit shown in Figure 3.
Fig. 5 is the apparatus structure synoptic diagram that method of cooling adopted of high-strength steel continuous heat treatment of the present invention.
Embodiment
Below will combine Figure of description and embodiment that the method for cooling of high-strength steel continuous heat treatment of the present invention is done further detailed description.
As shown in Figure 2, according to following step the band steel is cooled off:
(1) carry out slow cooling: the belt steel surface that will pass through the continuous annealing furnace soaking zone carries out jet slow cooling;
(2) carry out the aerosol cooling: adopt like Fig. 3 and aerosol spray refrigerating unit shower cooling aqueous vapor mist shown in Figure 4 belt steel surface is carried out further aerosol cooling, promptly at 40 of Fig. 5;
(3) adopt granulating unit as shown in Figure 5 to carry out the shrend cooling:
(3a) adopt a pair of water cutter that is arranged on band steel two surperficial both sides to spray the stratiform water column to belt steel surface, the injection direction of this stratiform water column is the acute angle angle with the direct of travel of band steel;
(3b) adopt two groups of nozzles that are arranged on band steel two surperficial both sides to spray high velocity jet to belt steel surface, this high velocity jet will be at the vapor bubbles of belt steel surface and the steam film belt steel surface that blows off, and this high velocity jet is the acute angle angle with being with the steel direct of travel;
(3c) will be with steel to be immersed in the water coolant; And adopt two groups to be arranged at the subsurface and nozzle that be located at band steel two surperficial both sides respectively of water coolant and to spray high velocity jet to belt steel surface; This high velocity jet will be at the vapor bubbles of belt steel surface and the steam film belt steel surface that blows off, and this high velocity jet is the acute angle angle with band steel direct of travel;
(4) water coolant of belt steel surface is dried.
Table 1 has been listed concrete process for cooling and the corresponding cooling performance of being implemented to the band steel of each intensity rank among the embodiment 1-3 of present technique scheme.
Table 1.
All adopted among each embodiment of this case like Fig. 3, aerosol refrigerating unit shown in Figure 4, as can be seen from the figure, the aerosol refrigerating unit have gas orifice 41 and with the vertically disposed water outlet 42 of gas orifice; Water outlet 42 supplies water through water pipe 43; The gas direction of gas orifice 41 ejections is vertical with band steel direct of travel, and vertical with the water (flow) direction of water outlet 42 ejections, because the gas-liquid angle is 90 °; Gas energy is fully used; Make the liquid bundle be in best shearing condition, can effectively the liquid bundle be broken for the drop crowd, thereby gas-liquid two-phase forms said water coolant aerosol near belt steel surface.
Among each embodiment of present technique scheme the device that adopts as shown in Figure 5, band steel 21 move vertically downward, three groups of 33 pairs of bands of aerosol refrigerating units steel 21 that are arranged at band steel 21 both sides at first carry out aerosol and cool off.Water cutter 22 is an acute angle angle with band steel direct of travel, at first sprays cold to the band steel; Adopt plurality of rows first nozzle 23 same and that be with the steel direct of travel to be the setting of acute angle angle to spray high velocity jet to the band steel then, the discharge of nozzle 23 is controlled by first valve 25; To carry out while boshing cold with spray with being located in the watch-quench tank 27 24 pairs of bands of subsurface plurality of rows second nozzle steel to use watch-quench tank 27 then, and second nozzle 24 is same to have the acute angle angle with band steel direct of travel, and the water yield of second nozzle 24 is controlled by second valve 26.After above-mentioned shrend cooling, the band steel is dried through the two pairs of squeezing rollers 28, limit portion band steel blow device 29 and the hot-air seasoning device 30 that set gradually along band steel direct of travel.Adjustable in order to realize the water yield and water temperature in the watch-quench tank 27, also be provided with filling pipe and valve 31 and water shoot and valve 32 thereof in the present embodiment.
Be noted that above enumerate be merely specific embodiment of the present invention, obviously the invention is not restricted to above embodiment, many similar variations are arranged thereupon.If those skilled in the art all should belong to protection scope of the present invention from all distortion that content disclosed by the invention directly derives or associates.
Claims (9)
1. the method for cooling of a high-strength steel continuous heat treatment is characterized in that, comprises the following steps:
The belt steel surface that (1) will pass through the continuous annealing furnace soaking zone carries out jet slow cooling;
(2) adopt an aerosol refrigerating unit shower cooling aqueous vapor mist that belt steel surface is carried out the aerosol cooling;
(3) adopt a cooling water jet unit to spray the stratiform water column to belt steel surface, the injection direction of layered water column is the acute angle angle with the direct of travel of band steel;
(4) adopt one first tuyere arrangement to spray high velocity jet to belt steel surface, the speed of said high velocity jet is set to the vapor bubbles of belt steel surface and the steam film belt steel surface that blows off;
(5) will be with steel to be immersed in the water coolant, and adopt one to be arranged at subsurface second tuyere arrangement of water coolant and to spray high velocity jet to belt steel surface, the speed of said high velocity jet is set to the vapor bubbles of belt steel surface and the steam film belt steel surface that blows off;
(6) water coolant of belt steel surface is dried.
2. the method for cooling of high-strength steel continuous heat treatment as claimed in claim 1 is characterized in that, the injection direction of the high velocity jet in the said step (5) is the acute angle angle with band steel direct of travel.
3. the method for cooling of high-strength steel continuous heat treatment as claimed in claim 2 is characterized in that, the injection direction of the high velocity jet in the said step (4) is vertical with the direct of travel of band steel.
4. the method for cooling of high-strength steel continuous heat treatment as claimed in claim 2 is characterized in that, the injection direction of the high velocity jet in the said step (4) is the acute angle angle with the direct of travel of band steel.
5. like the method for cooling of any described high-strength steel continuous heat treatment among the claim 1-4, it is characterized in that the temperature of the water coolant that is adopted in said step (2)-(5) is below 70 °.
6. the method for cooling of high-strength steel continuous heat treatment as claimed in claim 5 is characterized in that, the temperature of the water coolant that is adopted in said step (2)-(5) is below 50 °.
7. the method for cooling of high-strength steel continuous heat treatment as claimed in claim 6 is characterized in that, the water coolant that is adopted in said step (2)-(5) is a refrigerated water.
8. the method for cooling of high-strength steel continuous heat treatment as claimed in claim 7 is characterized in that, the cooling water jet unit that adopts in the said step (3) is the water cutter.
9. like the method for cooling of any described high-strength steel continuous heat treatment among the claim 1-4; It is characterized in that; The aerosol refrigerating unit that adopts in the said step (2) have gas orifice and with the vertically disposed water outlet of said gas orifice; The gas direction of said gas orifice ejection is vertical with band steel direct of travel, and vertical with the water (flow) direction of water outlet ejection, and gas-liquid two-phase forms said water coolant aerosol near belt steel surface.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103834792A (en) * | 2014-03-26 | 2014-06-04 | 东北大学 | Continuous roller type quenching technical method for steel plate |
| CN112795771A (en) * | 2020-12-30 | 2021-05-14 | 阳江宏旺实业有限公司 | Mist cooler, stainless steel continuous annealing cooling system and cooling method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112795771A (en) * | 2020-12-30 | 2021-05-14 | 阳江宏旺实业有限公司 | Mist cooler, stainless steel continuous annealing cooling system and cooling method thereof |
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| Publication number | Publication date |
|---|---|
| CN102747213B (en) | 2014-04-30 |
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